Rimfire Blend is a pain in the ass to handle. It's quite thin and will seep out of pretty much any container you put it in. I had some in my kit bag last year inside two layers of ziplock bags with kitchen roll between the two layers to catch seepage (I had played this game before!) and yet when I got to my destination the entire bag smelled of it. I won't fly with it any more.

You have to be religious about using a bore guide too, since it'll creep into every bit of your rifle if you're not careful. It could easily wash crud down into your trigger.

It works really well though, and it doesn't smell as horrible as a lot of the other good options. Their carbon remover isn't half bad too.